// BLTSIN.cpp
// This module processes simplified belt cards for a mechanical simulation system

#include <vector>
#include <string>
#include <algorithm>
#include <stdexcept>

// Define real type based on precision needs
using Real = float;

// Constants
constexpr int MAX_BELTS = 1000;      // Maximum number of belts
constexpr int MAX_SEGMENTS = 50;     // Maximum segments per belt
constexpr int MAX_NODES = 10000;     // Maximum nodes in the system
constexpr int BELT_ELEMENT_TYPE = 205; // Element type identifier for belts

// Error handling utility
class BeltError : public std::runtime_error {
public:
    BeltError(const std::string& message, int beltId = -1)
        : std::runtime_error(beltId >= 0 ? 
            ("Belt " + std::to_string(beltId) + ": " + message : message) {}
};

/**
 * @brief Processes simplified belt cards for mechanical simulation
 * 
 * This function reads and processes belt configuration data, performing:
 * 1) Parameter filling
 * 2) Output file writing
 * 
 * @param beltIds Array of belt identifiers
 * @param elementTypes Array of element types
 * @param elementData 2D array of element data
 * @param beltIntParams Integer parameters for belts (6 values per belt)
 * @param beltNodeParams Node parameters for belts
 * @param beltRealParams Real parameters for belts
 * @param beamIds Array of beam identifiers
 * @param nodeIds Array of node identifiers
 * @param beltNames Array of belt names (12 characters each)
 * @param startIndex Starting index for processing
 * @param endIndex Ending index for processing
 * @param maxSegments Maximum number of segments found (output)
 * @param curveParams Curve parameters object
 * @param curveObjIndices Curve object indices
 * @param intObjParams Integer object parameters
 * @param intObjIndices Integer object indices
 * @param realObjParams Real object parameters
 * @param realObjIndices Real object indices
 * @param beltObjIndices Belt object indices
 * @param filterFlag Filtering flag
 * @param printFlag Printing flag
 * @param ipcParams IPC parameters
 * @param errorFlag Error flag (output)
 */
void ProcessBelts(
    std::vector<int>& beltIds,
    const std::vector<int>& elementTypes,
    const std::vector<std::vector<int>>& elementData,
    std::vector<std::vector<int>>& beltIntParams,
    std::vector<int>& beltNodeParams,
    std::vector<Real>& beltRealParams,
    const std::vector<int>& beamIds,
    const std::vector<int>& nodeIds,
    std::vector<std::string>& beltNames,
    int& startIndex,
    int& endIndex,
    int& maxSegments,
    const std::string& curveParams,
    const std::vector<int>& curveObjIndices,
    const std::vector<int>& intObjParams,
    const std::vector<std::vector<int>>& intObjIndices,
    const std::vector<Real>& realObjParams,
    const std::vector<std::vector<int>>& realObjIndices,
    const std::vector<int>& beltObjIndices,
    int filterFlag,
    int printFlag,
    const std::vector<int>& ipcParams,
    bool& errorFlag)
{
    if (beltIntParams.empty()) return;

    startIndex = 0;
    endIndex = 0;
    maxSegments = 0;
    
    if (printFlag == 1) {
        // Write header to output file (simulated here)
    }

    // Process each belt
    for (size_t beltIdx = 0; beltIdx < beltIntParams.size(); ++beltIdx) {
        int objectIndex = beltObjIndices[beltIdx];
        
        // Get parameter indices for current belt
        int intParamIndex = intObjIndices[objectIndex][/*KOBBELTS*/0];
        int realParamIndex = realObjIndices[objectIndex][/*KOBBELTS*/0];
        int curveParamIndex = curveObjIndices[objectIndex][/*KOBBELTS*/0];
        
        int beltNumber = intObjParams[intParamIndex];
        Real forceTolerance = realObjParams[realParamIndex];
        
        // Set default force tolerance if not specified
        if (forceTolerance <= 0.0) forceTolerance = 1.0e-2f;
        
        // Process belt name if filtering is enabled
        if (filterFlag == 1) {
            std::string beltName = curveParams.substr(curveParamIndex, /*KOBATTRL*/76);
            beltNames[beltIdx] = beltName.substr(0, 12); // Truncate to 12 chars
            
            beltIds[beltIdx] = beltNumber;
        }
        
        // Extract belt configuration parameters
        int numRetractors = intObjParams[intParamIndex + 11];
        int startRetractor = intObjParams[intParamIndex + 12];
        int endRetractor = intObjParams[intParamIndex + 13];
        int numSegments = intObjParams[intParamIndex + 14];
        
        if (printFlag == 1) {

        }
        
        // Store basic belt parameters
        beltIntParams[beltIdx][0] = startRetractor;  // Retractor at beginning
        beltIntParams[beltIdx][1] = endRetractor;    // Retractor at end
        beltIntParams[beltIdx][2] = numSegments;     // Number of segments
        beltIntParams[beltIdx][3] = startIndex;      // Index in NBLTS
        beltIntParams[beltIdx][4] = endIndex;        // Index in RBLTS
        beltIntParams[beltIdx][5] = 0;               // Failure code (initially 0)
        
        std::array<int, 2> endNodes; // Start and end nodes
        
        // Process starting point information
        if (startRetractor == 0) {
            // Simple starting point (no retractor)
            int startNode = intObjParams[intParamIndex + 1];
            endNodes[0] = FindNodeIndex(2, startNode, "BELTS", errorFlag);
            
            if (endNodes[0] <= 0 && printFlag == 1) {
                errorFlag = true;
                throw BeltError("Node number error", beltNumber);
            }
            
            if (printFlag == 1) {
                // OutputFile << "\n STARTING-POINT DEFINITION\n" << std::endl;
                // OutputFile << "      NODE NUMBER .......................... " << startNode << std::endl;
            }
        } else {
            // Starting retractor information
            int startNode = intObjParams[intParamIndex + 1];
            int sensor1 = intObjParams[intParamIndex + 2];
            int curve1 = intObjParams[intParamIndex + 3];
            int sensor2 = intObjParams[intParamIndex + 4];
            int curve2 = intObjParams[intParamIndex + 5];
            Real initialForce = realObjParams[realParamIndex + 1];
            
            if (printFlag == 1) {
                // Output retractor information
                // Format similar to Fortran version
            }
            
            endNodes[0] = FindNodeIndex(2, startNode, "BELTS", errorFlag);
            if (endNodes[0] <= 0 && printFlag == 1) {
                errorFlag = true;
                throw BeltError("Node number error", beltNumber);
            }
            
            if (initialForce <= 0.0 && printFlag == 1) {
                errorFlag = true;
                throw BeltError("Tightening force must be positive", beltNumber);
            }
            
            // Process sensors and curves
            if (sensor1 != 0) sensor1 = FindNodeIndex(9, sensor1, "BELTS", errorFlag);
            if (sensor2 != 0) sensor2 = FindNodeIndex(9, sensor2, "BELTS", errorFlag);
            
            if (curve1 != 0) {
                curve1 = FindNodeIndex(6, curve1, "BELTS", errorFlag);
                SetIPCCurve(ipcParams, curve1, /*CURVE_BELT*/1, errorFlag);
            }
            
            if (curve2 != 0) {
                curve2 = FindNodeIndex(6, curve2, "BELTS", errorFlag);
                SetIPCCurve(ipcParams, curve2, /*CURVE_GENERIC*/2, errorFlag);
            }
            
            // Store retractor parameters
            int nodeParamIndex = startIndex;
            int realParamIndex = endIndex;
            
            beltNodeParams[nodeParamIndex + 0] = sensor1;
            beltNodeParams[nodeParamIndex + 1] = curve1;
            beltNodeParams[nodeParamIndex + 2] = sensor2;
            beltNodeParams[nodeParamIndex + 3] = curve2;
            
            beltRealParams[realParamIndex + 0] = initialForce;
            beltRealParams[realParamIndex + 1] = 0.0;
            beltRealParams[realParamIndex + 2] = 0.0;
            beltRealParams[realParamIndex + 3] = 0.0;
            beltRealParams[realParamIndex + 4] = forceTolerance;
        }
        
        // Process slipring segments
        for (int segIdx = 0; segIdx < numSegments - 1; ++segIdx) {
            int node = intObjParams[intParamIndex + 15 + segIdx];
            Real friction = realObjParams[realParamIndex + 2 + 2 * segIdx];
            Real tolerance = realObjParams[realParamIndex + 3 + 2 * segIdx];
            
            if (friction < 0.0 && printFlag == 1) {
                errorFlag = true;
                throw BeltError("Friction factor must be positive", beltNumber);
            }
            
            if (tolerance == 0.0) tolerance = forceTolerance;
            if (tolerance < 0.0 && printFlag == 1) {
                errorFlag = true;
                throw BeltError("Force tolerance must be positive", beltNumber);
            }
            
            if (printFlag == 1) {
                // Output slipring information
            }
            
            node = FindNodeIndex(2, node, "BELTS", errorFlag);
            if (node <= 0 && printFlag == 1) {
                errorFlag = true;
                throw BeltError("Node number error", beltNumber);
            }
            
            beltNodeParams[startIndex + 4 * startRetractor + 2 * segIdx] = node;
            beltRealParams[endIndex + 5 * startRetractor + 2 * segIdx] = friction;
            beltRealParams[endIndex + 5 * startRetractor + 2 * segIdx + 1] = tolerance;
        }
        
        // Process end point information (similar to starting point)
        // ... (omitted for brevity, but follows same pattern as starting point)
        
        // Find elements between retractors/sliprings
        int node1 = endNodes[0];
        for (int segIdx = 0; segIdx < numSegments; ++segIdx) {
            int paramIndex = startIndex + 4 * beltIntParams[beltIdx][0] + 2 * segIdx;
            int node2 = (segIdx == numSegments - 1) ? endNodes[1] : beltNodeParams[paramIndex];
            
            beltNodeParams[paramIndex + 1] = 0; // Direction flag
            
            // Search for belt elements connecting the nodes
            bool elementFound = false;
            for (size_t elemIdx = 0; elemIdx < elementTypes.size(); ++elemIdx) {
                if (elementTypes[elemIdx] == BELT_ELEMENT_TYPE) {
                    const auto& elemData = elementData[elemIdx];
                    
                    if (elemData[1] == node1 && elemData[2] == node2) {
                        beltNodeParams[paramIndex] = elemIdx;
                        beltNodeParams[paramIndex + 1] = 1;
                        elementFound = true;
                        break;
                    } else if (elemData[2] == node1 && elemData[1] == node2) {
                        beltNodeParams[paramIndex] = elemIdx;
                        beltNodeParams[paramIndex + 1] = -1;
                        elementFound = true;
                        break;
                    }
                }
            }
            
            if (!elementFound && printFlag == 1) {
                throw BeltError("No belt element between nodes", beltNumber);
            }
            
            node1 = node2;
        }
        
        // Update indices for next belt
        startIndex += 4 * numRetractors + 2 * numSegments;
        endIndex += 5 * numRetractors + 2 * numSegments;
        maxSegments = std::max(maxSegments, numSegments + beltIntParams[beltIdx][1]);
    }
}

// Helper functions (would be implemented elsewhere)
int FindNodeIndex(int type, int nodeId, const std::string& context, bool& errorFlag) {
    // Implementation would search node database and return index
    return nodeId; // Simplified for example
}

void SetIPCCurve(const std::vector<int>& ipcParams, int curveId, int curveType, bool& errorFlag) {
    // Implementation would configure IPC curve parameters
}